Which Is the Best Standard-Form Representation of the Following Argument

Which is the best standard-form representation of the following Argument from Principle?
Charles Murray has claimed, in print, that Black people are genetically inferior to White people. That kind of racist claim is totally unsupported by science, but has nevertheless supported attitudes and policies of racial oppression throughout the history of the USA.
Students, such as those at Middlebury College, who have staged noisy protests to prevent Charles Murray from speaking at their college deserve our moral respect. It is always right to prevent people from contributing to the oppression of minority groups, and that is what they did. Allowing Murray a platform would contribute to the oppression of minority groups, and those students stepped in and stopped it.

A) 1) It was right to prevent Charles Murray from speaking.
2) Preventing Charles Murray from speaking stops him from contributing to the oppression of minority groups.
So, it is always right to prevent people from contributing to the oppression of minority groups.
B) 1) It is always right to prevent people from contributing to the oppression of minority groups.
2) Preventing Charles Murray from speaking prevents a person from contributing to the oppression of minority groups.
So, it was right to prevent Charles Murray from speaking.
C) 1) Charles Murray has claimed, in print, that Black people are genetically inferior to White people.
2) Allowing Murray a platform to speak would contribute to the oppression of minority groups.
So, students did the right thing when they stopped Murray from speaking.
D) 1) Charles Murray's racist claim is totally unsupported by science.
2) Charles Murray's claims contribute to the oppression of minority groups. So, it is right to prevent Charles Murray from speaking.